1. The economy of most Middle Eastern countries is largely based ____ oil exports.
2. Research into the causes of cancer is ____ vital importance if we are to learn how to control the disease.
3. In his new job he will be responsible ____ the coordination of relief to the refugees.
4. Economic recession and rising unemployment, coupled ____ continued increases ____ retail food prices, have curtailed consumption.
5. In Ethiopia, primitive farming practices and uncontrolled clearing of natural vegetation have transformed much of the countrys highlands ____ bare landscapes, but all destroyed ____ erosion.
6. The advance in the steel industry has been marked ____ a progressive increase ____ size, complexity and capital outlay.
7. Infectious diseases are those which are caused ____ an invasion of the body ____ organisms from outside.
8. In order to understand the implications of research ____ brain development one has to make a systematic study ____ what children know.
9. The arrival of Europeans in America dislocated traditional ways of life and altered the world ____ recognition.
10. British TV is still stuck ____ a regulatory structure designed ____ a bygone age.